Before we start to mess with the VFS name-cache clean things up a little bit:

Isolate the namecache in its own file, and give it a dedicated malloc type.

sys/fs/nwfs/nwfs_io.c

@@ -86,7 +86,7 @@ extern int nwfs_pbuf_freecnt;
 static int
 nwfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) {
 	struct nwmount *nmp = VTONWFS(vp);
-	int error, count, i, len;
+	int error, count, i;
 	struct dirent dp;
 	struct nwnode *np = VTONW(vp);
 	struct nw_entry_info fattr;
@@ -94,7 +94,6 @@ nwfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) {
 	struct nameidata nami, *ndp = &nami;
 	struct componentname *cnp = &ndp->ni_cnd;
 	ncpfid fid;
-	u_char *cp;
 
 	np = VTONW(vp);
 	NCPVNDEBUG("dirname='%s'\n",np->n_name);
@@ -149,11 +148,7 @@ nwfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) {
 			if (!error) {
 				VTONW(newvp)->n_ctime = VTONW(newvp)->n_vattr.va_ctime.tv_sec;
 				cnp->cn_nameptr = dp.d_name;
-				len = cnp->cn_namelen = dp.d_namlen;
 				ndp->ni_vp = newvp;
-				cnp->cn_hash = 0;
-				for (cp = cnp->cn_nameptr; len; len--, cp++)
-					cnp->cn_hash += *cp;
 			        cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp);
 				vput(newvp);
 			} else

sys/fs/unionfs/union.h

@@ -86,7 +86,6 @@ struct union_node {
 	struct vnode		*un_dirvp;	/* Parent dir of uppervp */
 	struct vnode		*un_pvp;	/* Parent vnode */
 	char			*un_path;	/* saved component name */
-	int			un_hash;	/* saved un_path hash value */
 	int			un_openl;	/* # of opens on lowervp */
 	int			un_exclcnt;	/* exclusive count */
 	unsigned int		un_flags;

sys/fs/unionfs/union_subr.c

@@ -500,7 +500,6 @@ union_allocvp(vpp, mp, dvp, upperdvp, cnp, uppervp, lowervp, docache)
 		if (lowervp != un->un_lowervp) {
 			union_newlower(un, lowervp);
 			if (cnp && (lowervp != NULLVP)) {
-				un->un_hash = cnp->cn_hash;
 				un->un_path = malloc(cnp->cn_namelen+1,
 						M_TEMP, M_WAITOK);
 				bcopy(cnp->cn_nameptr, un->un_path,
@@ -584,12 +583,10 @@ union_allocvp(vpp, mp, dvp, upperdvp, cnp, uppervp, lowervp, docache)
 	un->un_openl = 0;
 
 	if (cnp && (lowervp != NULLVP)) {
-		un->un_hash = cnp->cn_hash;
 		un->un_path = malloc(cnp->cn_namelen+1, M_TEMP, M_WAITOK);
 		bcopy(cnp->cn_nameptr, un->un_path, cnp->cn_namelen);
 		un->un_path[cnp->cn_namelen] = '\0';
 	} else {
-		un->un_hash = 0;
 		un->un_path = 0;
 		un->un_dirvp = NULL;
 	}
@@ -865,7 +862,6 @@ union_relookup(um, dvp, vpp, cnp, cn, path, pathlen)
 	else
 		cn->cn_cred = um->um_cred;
 	cn->cn_nameptr = cn->cn_pnbuf;
-	cn->cn_hash = cnp->cn_hash;
 	cn->cn_consume = cnp->cn_consume;
 
 	VREF(dvp);
@@ -1045,7 +1041,6 @@ union_vn_create(vpp, un, p)
 	cn.cn_proc = p;
 	cn.cn_cred = p->p_ucred;
 	cn.cn_nameptr = cn.cn_pnbuf;
-	cn.cn_hash = un->un_hash;
 	cn.cn_consume = 0;
 
 	/*

sys/kern/kern_malloc.c

@@ -55,7 +55,7 @@
 #include <machine/cpu.h>
 #endif
 
-MALLOC_DEFINE(M_CACHE, "namecache", "Dynamically allocated cache entries");
+MALLOC_DEFINE(M_CACHE, "cache", "Various Dynamically allocated caches");
 MALLOC_DEFINE(M_DEVBUF, "devbuf", "device driver memory");
 MALLOC_DEFINE(M_TEMP, "temp", "misc temporary data buffers");
 

sys/kern/vfs_cache.c

@@ -45,7 +45,25 @@
 #include <sys/vnode.h>
 #include <sys/namei.h>
 #include <sys/malloc.h>
+#include <sys/sysproto.h>
+#include <sys/proc.h>
+#include <sys/filedesc.h>
 
+/*
+ * This structure describes the elements in the cache of recent
+ * names looked up by namei.
+ */
+
+struct	namecache {
+	LIST_ENTRY(namecache) nc_hash;	/* hash chain */
+	LIST_ENTRY(namecache) nc_src;	/* source vnode list */
+	TAILQ_ENTRY(namecache) nc_dst;	/* destination vnode list */
+	struct	vnode *nc_dvp;		/* vnode of parent of name */
+	struct	vnode *nc_vp;		/* vnode the name refers to */
+	u_char	nc_flag;		/* flag bits */
+	u_char	nc_nlen;		/* length of name */
+	char	nc_name[0];		/* segment name */
+};
 
 /*
  * Name caching works as follows:
@@ -67,8 +85,8 @@
 /*
  * Structures associated with name cacheing.
  */
-#define NCHHASH(dvp, cnp) \
-	(&nchashtbl[((dvp)->v_id + (cnp)->cn_hash) & nchash])
+#define NCHHASH(dvp, hash) \
+	(&nchashtbl[((dvp)->v_id + (hash)) & nchash])
 static LIST_HEAD(nchashhead, namecache) *nchashtbl;	/* Hash Table */
 static TAILQ_HEAD(, namecache) ncneg;	/* Hash Table */
 static u_long	nchash;			/* size of hash table */
@@ -108,6 +126,8 @@ static u_long numneghits; STATNODE(CTLFLAG_RD, numneghits, &numneghits);
 
 static void cache_zap __P((struct namecache *ncp));
 
+MALLOC_DEFINE(M_VFSCACHE, "vfscache", "VFS name cache entries");
+
 /*
  * Flags in namecache.nc_flag
  */
@@ -131,7 +151,7 @@ cache_zap(ncp)
 		numneg--;
 	}
 	numcache--;
-	free(ncp, M_CACHE);
+	free(ncp, M_VFSCACHE);
 }
 
 /*
@@ -155,7 +175,10 @@ cache_lookup(dvp, vpp, cnp)
 	struct vnode **vpp;
 	struct componentname *cnp;
 {
-	register struct namecache *ncp;
+	struct namecache *ncp;
+	u_long hash;
+	u_char *cp;
+	int len;
 
 	if (!doingcache) {
 		cnp->cn_flags &= ~MAKEENTRY;
@@ -182,7 +205,11 @@ cache_lookup(dvp, vpp, cnp)
 		}
 	}
 
-	LIST_FOREACH(ncp, (NCHHASH(dvp, cnp)), nc_hash) {
+	hash = 0;
+	len = cnp->cn_namelen;
+	for (cp = cnp->cn_nameptr; len; len--, cp++)
+		hash += *cp;
+	LIST_FOREACH(ncp, (NCHHASH(dvp, hash)), nc_hash) {
 		numchecks++;
 		if (ncp->nc_dvp == dvp && ncp->nc_nlen == cnp->cn_namelen &&
 		    !bcmp(ncp->nc_name, cnp->cn_nameptr, ncp->nc_nlen))
@@ -246,8 +273,11 @@ cache_enter(dvp, vp, cnp)
 	struct vnode *vp;
 	struct componentname *cnp;
 {
-	register struct namecache *ncp;
-	register struct nchashhead *ncpp;
+	struct namecache *ncp;
+	struct nchashhead *ncpp;
+	u_long hash;
+	u_char *cp, *dp;
+	int len;
 
 	if (!doingcache)
 		return;
@@ -269,7 +299,7 @@ cache_enter(dvp, vp, cnp)
 	}
 	 
 	ncp = (struct namecache *)
-		malloc(sizeof *ncp + cnp->cn_namelen, M_CACHE, M_WAITOK);
+		malloc(sizeof *ncp + cnp->cn_namelen, M_VFSCACHE, M_WAITOK);
 	bzero((char *)ncp, sizeof *ncp);
 	numcache++;
 	if (!vp) {
@@ -288,9 +318,12 @@ cache_enter(dvp, vp, cnp)
 	 */
 	ncp->nc_vp = vp;
 	ncp->nc_dvp = dvp;
-	ncp->nc_nlen = cnp->cn_namelen;
-	bcopy(cnp->cn_nameptr, ncp->nc_name, ncp->nc_nlen);
-	ncpp = NCHHASH(dvp, cnp);
+	len = ncp->nc_nlen = cnp->cn_namelen;
+	hash = 0;
+	dp = ncp->nc_name;
+	for (cp = cnp->cn_nameptr; len; len--, cp++, dp++)
+		hash += (*dp = *cp);
+	ncpp = NCHHASH(dvp, hash);
 	LIST_INSERT_HEAD(ncpp, ncp, nc_hash);
 	if (LIST_EMPTY(&dvp->v_cache_src))
 		vhold(dvp);
@@ -300,7 +333,7 @@ cache_enter(dvp, vp, cnp)
 	} else {
 		TAILQ_INSERT_TAIL(&ncneg, ncp, nc_dst);
 	}
-	if (numneg*ncnegfactor > numcache) {
+	if (numneg * ncnegfactor > numcache) {
 		ncp = TAILQ_FIRST(&ncneg);
 		cache_zap(ncp);
 	}
@@ -314,7 +347,7 @@ nchinit()
 {
 
 	TAILQ_INIT(&ncneg);
-	nchashtbl = hashinit(desiredvnodes*2, M_CACHE, &nchash);
+	nchashtbl = hashinit(desiredvnodes*2, M_VFSCACHE, &nchash);
 }
 
 /*
@@ -456,3 +489,99 @@ vfs_cache_lookup(ap)
 		return (error);
 	return (VOP_CACHEDLOOKUP(ap->a_dvp, ap->a_vpp, ap->a_cnp));
 }
+
+
+#ifndef _SYS_SYSPROTO_H_
+struct  __getcwd_args {
+	u_char	*buf;
+	u_int	buflen;
+};
+#endif
+
+#define STATNODE(mode, name, var) \
+	SYSCTL_INT(_vfs_cache, OID_AUTO, name, mode, var, 0, "");
+
+static int disablecwd;
+SYSCTL_INT(_debug, OID_AUTO, disablecwd, CTLFLAG_RW, &disablecwd, 0, "");
+
+static u_long numcwdcalls; STATNODE(CTLFLAG_RD, numcwdcalls, &numcwdcalls);
+static u_long numcwdfail1; STATNODE(CTLFLAG_RD, numcwdfail1, &numcwdfail1);
+static u_long numcwdfail2; STATNODE(CTLFLAG_RD, numcwdfail2, &numcwdfail2);
+static u_long numcwdfail3; STATNODE(CTLFLAG_RD, numcwdfail3, &numcwdfail3);
+static u_long numcwdfail4; STATNODE(CTLFLAG_RD, numcwdfail4, &numcwdfail4);
+static u_long numcwdfound; STATNODE(CTLFLAG_RD, numcwdfound, &numcwdfound);
+int
+__getcwd(p, uap)
+	struct proc *p;
+	struct __getcwd_args *uap;
+{
+	char *bp, *buf;
+	int error, i, slash_prefixed;
+	struct filedesc *fdp;
+	struct namecache *ncp;
+	struct vnode *vp;
+
+	numcwdcalls++;
+	if (disablecwd)
+		return (ENODEV);
+	if (uap->buflen < 2)
+		return (EINVAL);
+	if (uap->buflen > MAXPATHLEN)
+		uap->buflen = MAXPATHLEN;
+	buf = bp = malloc(uap->buflen, M_TEMP, M_WAITOK);
+	bp += uap->buflen - 1;
+	*bp = '\0';
+	fdp = p->p_fd;
+	slash_prefixed = 0;
+	for (vp = fdp->fd_cdir; vp != fdp->fd_rdir && vp != rootvnode;) {
+		if (vp->v_flag & VROOT) {
+			vp = vp->v_mount->mnt_vnodecovered;
+			continue;
+		}
+		if (vp->v_dd->v_id != vp->v_ddid) {
+			numcwdfail1++;
+			free(buf, M_TEMP);
+			return (ENOTDIR);
+		}
+		ncp = TAILQ_FIRST(&vp->v_cache_dst);
+		if (!ncp) {
+			numcwdfail2++;
+			free(buf, M_TEMP);
+			return (ENOENT);
+		}
+		if (ncp->nc_dvp != vp->v_dd) {
+			numcwdfail3++;
+			free(buf, M_TEMP);
+			return (EBADF);
+		}
+		for (i = ncp->nc_nlen - 1; i >= 0; i--) {
+			if (bp == buf) {
+				numcwdfail4++;
+				free(buf, M_TEMP);
+				return (ENOMEM);
+			}
+			*--bp = ncp->nc_name[i];
+		}
+		if (bp == buf) {
+			numcwdfail4++;
+			free(buf, M_TEMP);
+			return (ENOMEM);
+		}
+		*--bp = '/';
+		slash_prefixed = 1;
+		vp = vp->v_dd;
+	}
+	if (!slash_prefixed) {
+		if (bp == buf) {
+			numcwdfail4++;
+			free(buf, M_TEMP);
+			return (ENOMEM);
+		}
+		*--bp = '/';
+	}
+	numcwdfound++;
+	error = copyout(bp, uap->buf, strlen(bp) + 1);
+	free(buf, M_TEMP);
+	return (error);
+}
+

sys/kern/vfs_extattr.c

@@ -3041,101 +3041,6 @@ getvnode(fdp, fd, fpp)
 	*fpp = fp;
 	return (0);
 }
-#ifndef _SYS_SYSPROTO_H_
-struct  __getcwd_args {
-	u_char	*buf;
-	u_int	buflen;
-};
-#endif
-
-SYSCTL_DECL(_vfs_cache);
-#define STATNODE(mode, name, var) \
-	SYSCTL_INT(_vfs_cache, OID_AUTO, name, mode, var, 0, "");
-
-static int disablecwd;
-SYSCTL_INT(_debug, OID_AUTO, disablecwd, CTLFLAG_RW, &disablecwd, 0, "");
-
-static u_long numcwdcalls; STATNODE(CTLFLAG_RD, numcwdcalls, &numcwdcalls);
-static u_long numcwdfail1; STATNODE(CTLFLAG_RD, numcwdfail1, &numcwdfail1);
-static u_long numcwdfail2; STATNODE(CTLFLAG_RD, numcwdfail2, &numcwdfail2);
-static u_long numcwdfail3; STATNODE(CTLFLAG_RD, numcwdfail3, &numcwdfail3);
-static u_long numcwdfail4; STATNODE(CTLFLAG_RD, numcwdfail4, &numcwdfail4);
-static u_long numcwdfound; STATNODE(CTLFLAG_RD, numcwdfound, &numcwdfound);
-int
-__getcwd(p, uap)
-	struct proc *p;
-	struct __getcwd_args *uap;
-{
-	char *bp, *buf;
-	int error, i, slash_prefixed;
-	struct filedesc *fdp;
-	struct namecache *ncp;
-	struct vnode *vp;
-
-	numcwdcalls++;
-	if (disablecwd)
-		return (ENODEV);
-	if (uap->buflen < 2)
-		return (EINVAL);
-	if (uap->buflen > MAXPATHLEN)
-		uap->buflen = MAXPATHLEN;
-	buf = bp = malloc(uap->buflen, M_TEMP, M_WAITOK);
-	bp += uap->buflen - 1;
-	*bp = '\0';
-	fdp = p->p_fd;
-	slash_prefixed = 0;
-	for (vp = fdp->fd_cdir; vp != fdp->fd_rdir && vp != rootvnode;) {
-		if (vp->v_flag & VROOT) {
-			vp = vp->v_mount->mnt_vnodecovered;
-			continue;
-		}
-		if (vp->v_dd->v_id != vp->v_ddid) {
-			numcwdfail1++;
-			free(buf, M_TEMP);
-			return (ENOTDIR);
-		}
-		ncp = TAILQ_FIRST(&vp->v_cache_dst);
-		if (!ncp) {
-			numcwdfail2++;
-			free(buf, M_TEMP);
-			return (ENOENT);
-		}
-		if (ncp->nc_dvp != vp->v_dd) {
-			numcwdfail3++;
-			free(buf, M_TEMP);
-			return (EBADF);
-		}
-		for (i = ncp->nc_nlen - 1; i >= 0; i--) {
-			if (bp == buf) {
-				numcwdfail4++;
-				free(buf, M_TEMP);
-				return (ENOMEM);
-			}
-			*--bp = ncp->nc_name[i];
-		}
-		if (bp == buf) {
-			numcwdfail4++;
-			free(buf, M_TEMP);
-			return (ENOMEM);
-		}
-		*--bp = '/';
-		slash_prefixed = 1;
-		vp = vp->v_dd;
-	}
-	if (!slash_prefixed) {
-		if (bp == buf) {
-			numcwdfail4++;
-			free(buf, M_TEMP);
-			return (ENOMEM);
-		}
-		*--bp = '/';
-	}
-	numcwdfound++;
-	error = copyout(bp, uap->buf, strlen(bp) + 1);
-	free(buf, M_TEMP);
-	return (error);
-}
-
 /*
  * Get (NFS) file handle
  */

sys/kern/vfs_lookup.c

@@ -297,16 +297,14 @@ lookup(ndp)
 	/*
 	 * Search a new directory.
 	 *
-	 * The cn_hash value is for use by vfs_cache.
 	 * The last component of the filename is left accessible via
 	 * cnp->cn_nameptr for callers that need the name. Callers needing
 	 * the name set the SAVENAME flag. When done, they assume
 	 * responsibility for freeing the pathname buffer.
 	 */
 	cnp->cn_consume = 0;
-	cnp->cn_hash = 0;
 	for (cp = cnp->cn_nameptr; *cp != 0 && *cp != '/'; cp++)
-		cnp->cn_hash += (unsigned char)*cp;
+		continue;
 	cnp->cn_namelen = cp - cnp->cn_nameptr;
 	if (cnp->cn_namelen > NAME_MAX) {
 		error = ENAMETOOLONG;
@@ -601,17 +599,12 @@ relookup(dvp, vpp, cnp)
 	/*
 	 * Search a new directory.
 	 *
-	 * The cn_hash value is for use by vfs_cache.
 	 * The last component of the filename is left accessible via
 	 * cnp->cn_nameptr for callers that need the name. Callers needing
 	 * the name set the SAVENAME flag. When done, they assume
 	 * responsibility for freeing the pathname buffer.
 	 */
 #ifdef NAMEI_DIAGNOSTIC
-	for (newhash = 0, cp = cnp->cn_nameptr; *cp != 0 && *cp != '/'; cp++)
-		newhash += (unsigned char)*cp;
-	if (newhash != cnp->cn_hash)
-		panic("relookup: bad hash");
 	if (cnp->cn_namelen != cp - cnp->cn_nameptr)
 		panic ("relookup: bad len");
 	if (*cp != 0)

sys/kern/vfs_syscalls.c

@@ -3041,101 +3041,6 @@ getvnode(fdp, fd, fpp)
 	*fpp = fp;
 	return (0);
 }
-#ifndef _SYS_SYSPROTO_H_
-struct  __getcwd_args {
-	u_char	*buf;
-	u_int	buflen;
-};
-#endif
-
-SYSCTL_DECL(_vfs_cache);
-#define STATNODE(mode, name, var) \
-	SYSCTL_INT(_vfs_cache, OID_AUTO, name, mode, var, 0, "");
-
-static int disablecwd;
-SYSCTL_INT(_debug, OID_AUTO, disablecwd, CTLFLAG_RW, &disablecwd, 0, "");
-
-static u_long numcwdcalls; STATNODE(CTLFLAG_RD, numcwdcalls, &numcwdcalls);
-static u_long numcwdfail1; STATNODE(CTLFLAG_RD, numcwdfail1, &numcwdfail1);
-static u_long numcwdfail2; STATNODE(CTLFLAG_RD, numcwdfail2, &numcwdfail2);
-static u_long numcwdfail3; STATNODE(CTLFLAG_RD, numcwdfail3, &numcwdfail3);
-static u_long numcwdfail4; STATNODE(CTLFLAG_RD, numcwdfail4, &numcwdfail4);
-static u_long numcwdfound; STATNODE(CTLFLAG_RD, numcwdfound, &numcwdfound);
-int
-__getcwd(p, uap)
-	struct proc *p;
-	struct __getcwd_args *uap;
-{
-	char *bp, *buf;
-	int error, i, slash_prefixed;
-	struct filedesc *fdp;
-	struct namecache *ncp;
-	struct vnode *vp;
-
-	numcwdcalls++;
-	if (disablecwd)
-		return (ENODEV);
-	if (uap->buflen < 2)
-		return (EINVAL);
-	if (uap->buflen > MAXPATHLEN)
-		uap->buflen = MAXPATHLEN;
-	buf = bp = malloc(uap->buflen, M_TEMP, M_WAITOK);
-	bp += uap->buflen - 1;
-	*bp = '\0';
-	fdp = p->p_fd;
-	slash_prefixed = 0;
-	for (vp = fdp->fd_cdir; vp != fdp->fd_rdir && vp != rootvnode;) {
-		if (vp->v_flag & VROOT) {
-			vp = vp->v_mount->mnt_vnodecovered;
-			continue;
-		}
-		if (vp->v_dd->v_id != vp->v_ddid) {
-			numcwdfail1++;
-			free(buf, M_TEMP);
-			return (ENOTDIR);
-		}
-		ncp = TAILQ_FIRST(&vp->v_cache_dst);
-		if (!ncp) {
-			numcwdfail2++;
-			free(buf, M_TEMP);
-			return (ENOENT);
-		}
-		if (ncp->nc_dvp != vp->v_dd) {
-			numcwdfail3++;
-			free(buf, M_TEMP);
-			return (EBADF);
-		}
-		for (i = ncp->nc_nlen - 1; i >= 0; i--) {
-			if (bp == buf) {
-				numcwdfail4++;
-				free(buf, M_TEMP);
-				return (ENOMEM);
-			}
-			*--bp = ncp->nc_name[i];
-		}
-		if (bp == buf) {
-			numcwdfail4++;
-			free(buf, M_TEMP);
-			return (ENOMEM);
-		}
-		*--bp = '/';
-		slash_prefixed = 1;
-		vp = vp->v_dd;
-	}
-	if (!slash_prefixed) {
-		if (bp == buf) {
-			numcwdfail4++;
-			free(buf, M_TEMP);
-			return (ENOMEM);
-		}
-		*--bp = '/';
-	}
-	numcwdfound++;
-	error = copyout(bp, uap->buf, strlen(bp) + 1);
-	free(buf, M_TEMP);
-	return (error);
-}
-
 /*
  * Get (NFS) file handle
  */

sys/miscfs/union/union.h

@@ -86,7 +86,6 @@ struct union_node {
 	struct vnode		*un_dirvp;	/* Parent dir of uppervp */
 	struct vnode		*un_pvp;	/* Parent vnode */
 	char			*un_path;	/* saved component name */
-	int			un_hash;	/* saved un_path hash value */
 	int			un_openl;	/* # of opens on lowervp */
 	int			un_exclcnt;	/* exclusive count */
 	unsigned int		un_flags;

sys/miscfs/union/union_subr.c

@@ -500,7 +500,6 @@ union_allocvp(vpp, mp, dvp, upperdvp, cnp, uppervp, lowervp, docache)
 		if (lowervp != un->un_lowervp) {
 			union_newlower(un, lowervp);
 			if (cnp && (lowervp != NULLVP)) {
-				un->un_hash = cnp->cn_hash;
 				un->un_path = malloc(cnp->cn_namelen+1,
 						M_TEMP, M_WAITOK);
 				bcopy(cnp->cn_nameptr, un->un_path,
@@ -584,12 +583,10 @@ union_allocvp(vpp, mp, dvp, upperdvp, cnp, uppervp, lowervp, docache)
 	un->un_openl = 0;
 
 	if (cnp && (lowervp != NULLVP)) {
-		un->un_hash = cnp->cn_hash;
 		un->un_path = malloc(cnp->cn_namelen+1, M_TEMP, M_WAITOK);
 		bcopy(cnp->cn_nameptr, un->un_path, cnp->cn_namelen);
 		un->un_path[cnp->cn_namelen] = '\0';
 	} else {
-		un->un_hash = 0;
 		un->un_path = 0;
 		un->un_dirvp = NULL;
 	}
@@ -865,7 +862,6 @@ union_relookup(um, dvp, vpp, cnp, cn, path, pathlen)
 	else
 		cn->cn_cred = um->um_cred;
 	cn->cn_nameptr = cn->cn_pnbuf;
-	cn->cn_hash = cnp->cn_hash;
 	cn->cn_consume = cnp->cn_consume;
 
 	VREF(dvp);
@@ -1045,7 +1041,6 @@ union_vn_create(vpp, un, p)
 	cn.cn_proc = p;
 	cn.cn_cred = p->p_ucred;
 	cn.cn_nameptr = cn.cn_pnbuf;
-	cn.cn_hash = un->un_hash;
 	cn.cn_consume = 0;
 
 	/*

sys/nfs/nfs_common.c

@@ -1510,7 +1510,6 @@ nfs_namei(ndp, fhp, len, slp, nam, mdp, dposp, retdirp, p, kerbflag, pubflag)
 	tocp = cnp->cn_pnbuf;
 	md = *mdp;
 	rem = mtod(md, caddr_t) + md->m_len - fromcp;
-	cnp->cn_hash = 0;
 	for (i = 0; i < len; i++) {
 		while (rem == 0) {
 			md = md->m_next;
@@ -1525,7 +1524,6 @@ nfs_namei(ndp, fhp, len, slp, nam, mdp, dposp, retdirp, p, kerbflag, pubflag)
 			error = EACCES;
 			goto out;
 		}
-		cnp->cn_hash += (unsigned char)*fromcp;
 		*tocp++ = *fromcp++;
 		rem--;
 	}

sys/nfs/nfs_subs.c

@@ -1510,7 +1510,6 @@ nfs_namei(ndp, fhp, len, slp, nam, mdp, dposp, retdirp, p, kerbflag, pubflag)
 	tocp = cnp->cn_pnbuf;
 	md = *mdp;
 	rem = mtod(md, caddr_t) + md->m_len - fromcp;
-	cnp->cn_hash = 0;
 	for (i = 0; i < len; i++) {
 		while (rem == 0) {
 			md = md->m_next;
@@ -1525,7 +1524,6 @@ nfs_namei(ndp, fhp, len, slp, nam, mdp, dposp, retdirp, p, kerbflag, pubflag)
 			error = EACCES;
 			goto out;
 		}
-		cnp->cn_hash += (unsigned char)*fromcp;
 		*tocp++ = *fromcp++;
 		rem--;
 	}

sys/nfs/nfs_vnops.c

@@ -2373,10 +2373,6 @@ nfs_readdirplusrpc(vp, uiop, cred)
 				dp->d_type =
 				    IFTODT(VTTOIF(np->n_vattr.va_type));
 				ndp->ni_vp = newvp;
-				cnp->cn_hash = 0;
-				for (cp = cnp->cn_nameptr, i = 1; i <= len;
-				    i++, cp++)
-				    cnp->cn_hash += (unsigned char)*cp;
 			        cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp);
 			    }
 			} else {

sys/nfsclient/nfs_subs.c

@@ -1510,7 +1510,6 @@ nfs_namei(ndp, fhp, len, slp, nam, mdp, dposp, retdirp, p, kerbflag, pubflag)
 	tocp = cnp->cn_pnbuf;
 	md = *mdp;
 	rem = mtod(md, caddr_t) + md->m_len - fromcp;
-	cnp->cn_hash = 0;
 	for (i = 0; i < len; i++) {
 		while (rem == 0) {
 			md = md->m_next;
@@ -1525,7 +1524,6 @@ nfs_namei(ndp, fhp, len, slp, nam, mdp, dposp, retdirp, p, kerbflag, pubflag)
 			error = EACCES;
 			goto out;
 		}
-		cnp->cn_hash += (unsigned char)*fromcp;
 		*tocp++ = *fromcp++;
 		rem--;
 	}

sys/nfsclient/nfs_vnops.c

@@ -2373,10 +2373,6 @@ nfs_readdirplusrpc(vp, uiop, cred)
 				dp->d_type =
 				    IFTODT(VTTOIF(np->n_vattr.va_type));
 				ndp->ni_vp = newvp;
-				cnp->cn_hash = 0;
-				for (cp = cnp->cn_nameptr, i = 1; i <= len;
-				    i++, cp++)
-				    cnp->cn_hash += (unsigned char)*cp;
 			        cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp);
 			    }
 			} else {

sys/nfsserver/nfs_srvsubs.c

@@ -1510,7 +1510,6 @@ nfs_namei(ndp, fhp, len, slp, nam, mdp, dposp, retdirp, p, kerbflag, pubflag)
 	tocp = cnp->cn_pnbuf;
 	md = *mdp;
 	rem = mtod(md, caddr_t) + md->m_len - fromcp;
-	cnp->cn_hash = 0;
 	for (i = 0; i < len; i++) {
 		while (rem == 0) {
 			md = md->m_next;
@@ -1525,7 +1524,6 @@ nfs_namei(ndp, fhp, len, slp, nam, mdp, dposp, retdirp, p, kerbflag, pubflag)
 			error = EACCES;
 			goto out;
 		}
-		cnp->cn_hash += (unsigned char)*fromcp;
 		*tocp++ = *fromcp++;
 		rem--;
 	}

sys/nwfs/nwfs_io.c

@@ -86,7 +86,7 @@ extern int nwfs_pbuf_freecnt;
 static int
 nwfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) {
 	struct nwmount *nmp = VTONWFS(vp);
-	int error, count, i, len;
+	int error, count, i;
 	struct dirent dp;
 	struct nwnode *np = VTONW(vp);
 	struct nw_entry_info fattr;
@@ -94,7 +94,6 @@ nwfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) {
 	struct nameidata nami, *ndp = &nami;
 	struct componentname *cnp = &ndp->ni_cnd;
 	ncpfid fid;
-	u_char *cp;
 
 	np = VTONW(vp);
 	NCPVNDEBUG("dirname='%s'\n",np->n_name);
@@ -149,11 +148,7 @@ nwfs_readvdir(struct vnode *vp, struct uio *uio, struct ucred *cred) {
 			if (!error) {
 				VTONW(newvp)->n_ctime = VTONW(newvp)->n_vattr.va_ctime.tv_sec;
 				cnp->cn_nameptr = dp.d_name;
-				len = cnp->cn_namelen = dp.d_namlen;
 				ndp->ni_vp = newvp;
-				cnp->cn_hash = 0;
-				for (cp = cnp->cn_nameptr; len; len--, cp++)
-					cnp->cn_hash += *cp;
 			        cache_enter(ndp->ni_dvp, ndp->ni_vp, cnp);
 				vput(newvp);
 			} else

sys/sys/namei.h

@@ -89,7 +89,6 @@ struct nameidata {
 		char	*cn_pnbuf;	/* pathname buffer */
 		char	*cn_nameptr;	/* pointer to looked up name */
 		long	cn_namelen;	/* length of looked up component */
-		u_long	cn_hash;	/* hash value of looked up name */
 		long	cn_consume;	/* chars to consume in lookup() */
 	} ni_cnd;
 };
@@ -154,22 +153,6 @@ struct nameidata {
 }
 #endif
 
-/*
- * This structure describes the elements in the cache of recent
- * names looked up by namei.
- */
-
-struct	namecache {
-	LIST_ENTRY(namecache) nc_hash;	/* hash chain */
-	LIST_ENTRY(namecache) nc_src;	/* source vnode list */
-	TAILQ_ENTRY(namecache) nc_dst;	/* destination vnode list */
-	struct	vnode *nc_dvp;		/* vnode of parent of name */
-	struct	vnode *nc_vp;		/* vnode the name refers to */
-	u_char	nc_flag;		/* flag bits */
-	u_char	nc_nlen;		/* length of name */
-	char	nc_name[0];		/* segment name */
-};
-
 #ifdef KERNEL
 
 int	namei __P((struct nameidata *ndp));